Pa. High School Stabbing Suspect Alex Hribal Not 'Well-Liked': Source

Alex Hribal, the suspect in the multiple stabbings at the Franklin Regional High School in Murrysville, Pa., is escorted by police to a district magistrate to be arraigned, April 9, 2014, in Export, Pa.

The 16-year-old student accused of going on a stabbing rampage today at a Pennsylvania high school "wasn't a real well-liked kid" and had previously made death threats, the brother of a witness told ABCNews.com.

Alex Hribal is a sophomore at Franklin Regional High School, where the bloodshed happened today, said police. He's being held at a juvenile detention center in Westmoreland County after being charged with four counts of attempted criminal homicide, 21 counts of aggravated assault and one count of possession of a weapon on school property.